Recent changes to bugs

Reset hangs emulator

2006-02-13T08:59:55Z

A reset sometimes hangs the emulator. This is not the
case with every reset but has a probability of ~0.5.

Game image drol.d64 results in exception.

2005-01-22T11:04:02Z

Loading from game image drol.d64 as available on
c64.com results in ArrayIndexOutOfBonds.

CIA timers hang the emulation.

2005-01-06T00:24:16Z

Test case is the game bandits.d64

Behaviour is that the emulation hangs if this game is
RUN. The reason for that is that the CIA timer
emulation in multi-shot mode refuses to release the kept
monitor which results in the fact that a call to a timer
restart blocks (since being synchronised on the same
monitor).

Solution is to wait() instead of sleep(), since the former
does release held monitors while wait()ing, allowing the
restart call to succeed.

Defect was introduced with the solution for the
multiprocessor race condition.

Indirect Addressing crosses page boundaries

2005-01-06T00:18:44Z

All indirect addressing modes currently cross page
boundaries which is wrong. The following cites the
relevant parts of the 6510 instruction set docs that can
be found at
www.digitpress.com/the_digs/vic20/melick/6502b.txt :

Indirect addressing modes do not handle page boundary
crossing at all. When the parameter's low byte is $FF,
the effective address wraps around and the CPU fetches
high byte from $xx00 instead of $xx00+$0100.
E.g. JMP ($01FF) fetches PCL from $01FF and PCH
from $0100, and LDA ($FF),Y fetches the base address
from $FF and $00.
Indexed zero page addressing modes never fix the
page address on crossing the zero page boundary.
E.g. LDX #$01 : LDA ($FF,X) loads the effective
address from $00 and $01.

This impacts plain indirect addressing as well as the zero
page indirect indexed addressing modes. The impacted
component is the processor emulation in Cpu6510.java.

Reset not possible when module marker set.

2004-08-19T06:53:46Z

If a program sets the module start vector, then reset is
not longer possible, instead the module autostart is
performed on resetting.

While this nicely emulates the original 64's behaviour, it
is not possible without closing the emulator to get rid of
games using this feature.

Either the reset should alway be a hard-reset, also
resetting the module marker, or it should be possible
from the user interface to select soft or hard reseT:

Dsiplay of about dialog fails in webstart

2004-06-05T09:02:29Z

The about dialog does not open under webstart. Reason
is access to the system properties that is not allowed in
a sandbox environment.

Build target dist incomplete

2004-06-05T08:59:31Z

The dist build target currently does only create the
binary executables, not the web site.

Dist should create everything needed for a distribution.

Executable jar contains *.html docs.

2003-06-10T20:42:25Z

Spezl,

the distribution jar file contains again *.html. This
results in a visible growth of about 100k of the release.
Results from the 20030610 reqork of the ant script.

Too fast!?

2003-05-21T07:33:04Z

I'm playing Stellar7. The game is working completely,
but IT RUNS TOO FAST. I'm playing on a 500Mhz x86
system.

Thanks.

Sprite display is wrong

2003-05-20T16:57:27Z

I played the game Archon with Route64. In the initial
screen the sprite display is not working -- the text
should read "free fall" but is "free fall". Inside the
game the header reads "Arc hon" instead
of "Archon".